HBOS 20221026 on Amp3 + DSP -> no sound

After upgrading my Pi2 with Amp3 + DSP to HiFiBerry OS 20221026 it does not play anything any more. From the Web UI everything looks ok (Amp3 + DSP is correctly detected). When I "play" a source (radio or Spotify) the Web UI shows the track including cover art. The Amp3 board itself (not the speakers) makes a low volume white noise as it always does when it plays something. I have checked volume, volume limits, channel activation; everything looks ok. But there is no sound from the speakers after the update.


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